Ion-Exchange Properties of Transcarpathian Natural Zeolites

Abstract

The adsorption of ammonium ions, radionuclide ions (Sr2+ and Cs+) and heavy metal ions (Ni2+, Cr3+, Fe3+ and Hg2+) on natural Sokyrnytsky clinoptilolite has been investigated. Effective cation exchange of heavy metal ions and radioactive elements was observed with samples of the clinoptilolite which had been pretreated with ammonium chloride solutions. The adsorption isotherms for such cations from solutions of 0.5–1.0 mg/l ion content were studied under static conditions for adsorbent particle size fractions of 1.5–2.5 mm. Solid phases and solution aliquots were analyzed by X-ray fluorescence methods for Sr2+ ions while the concentrations of other ions were analyzed by spectrophotometric methods.

Adsorption of sulfur dioxide on natural clinoptilolite chemically modified with salt solutions

“…Ion exchange for the treatment of drinking and wastewaters [1][2][3][4][5][6][7][8][9][10][11][12], demineralization of sea water or water softening [13], as well as for uptake and utilization of heavy metals [13,14]. In these cases the investigations are directed to determination of: the capacity of the material applied [1][2][3][4][15][16][17][18]; the working conditions, e.g.…”

Adsorption of Lead(II) Ions on Transcarpathian Clinoptilolite

“…*Author to whom all correspondence should be addressed. et al 1998;Tarasevich et al 1979). Similar investigations have been carried out on zeolitic materials obtained from other regions (Lee et al 1999;Petruzzelli et al 1999).…”

“…et al 1998;Tarasevich et al 1979). Similar investigations have been carried out on zeolitic materials obtained from other regions (Lee et al 1999;Petruzzelli et al 1999). The purpose of the present studies was to develop a method for the removal of lead compounds via the use of modified forms of Transcarpathian clinoptilolite.…”

“…Previous work has shown that Transcarpathian zeolite as well as mordenite can be used successfully for removing heavy metal ions from water (Gomonaj et al 1999;Poliakov et al 1997), radionuclides (Gomonaj et al 2000), organic and † First presented at the 5th Ukrainian-Polish Symposium on Theoretical and Experimental Studies of Interfacial Phenomena and their Technological Applications, Odessa, Ukraine, 4-9 September 2000. *Author to whom all correspondence should be addressed.…”

Compatible Adsorption of Strontium and Zinc Ions as Well as Vitamins on Zeolites

“…Previous workers have described the use of various sorbents capable of selective adsorption for the removal of radionuclides and other toxic substances from soils and organic materials (Gomonaj et al 1997(Gomonaj et al , 1998(Gomonaj et al , 1999Polyakov et al 1997;Vasylechko et al 1998;Kaleta 1996;Tarasevich et al 1979). However, in practice, such sorbents remove not only the substance under consideration, but also a series of important microelements and vitamins necessary for the normal development of living organisms.…”